Batshuayi had to be carried from the pitch on a stretcher towards the end of Dortmund's Ruhr derby loss to rivals Schalke in the Bundesliga on Sunday.
The worst thing about such a serious injury at this stage of the campaign is that it makes the 24-year-old a huge doubt ahead of the World Cup, which is less than two months away. There are even suggestions that it could be a broken ankle, which would most definitely rule Michy out for the rest of the season as well as the World Cup this summer.
Batshuayi is expected to return to Chelsea for the remainder of the season in hope that the medical team at Stamford Bridge can get him back to fitness as soon as possible.More news: Minnesota Timberwolves: 5 keys to series vs. Rockets
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On its website, Dortmund said: "There remains a chance that he could still feature for the Belgian national team at the World Cup in Russian Federation this summer", while confirming that their forward was likely to be out for the rest of the season.
Dortmund's statement confirming Batshuayi's injury said it was "in the realm of possibility" he could recover in time for the World Cup.
Batshuayi is playing on loan at Borussia Dortmund where he has lit up the Signal Iduna Park, netting seven times in 9 appearances.